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Tibersyrnola bacillum
''Tibersyrnola bacillum'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔Rosenberg, G. (2015). Tibersyrnola bacillum (Pilsbry, 1901). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=739236 on 2015-04-16〕
==Description==
The length of the shell varies between 5.5 mm and 12 mm.
The slender shell has a rod-like shape. It has a particular type of coloration. It is marbled reddish-brown and white, with a narrow band of alternate brown and white spots revolving midway between sutures and on the middle of the upper surface of the body whorl, which has a white peripheral belt. This coloring is
sometimes very faint. The whorl of the protoconch stands obliquely on edge, the very short spire inclined downward. The 12½ or 13 subsequent whorls of the teleoconch are flat, and separated by deeply cut sutures. They are sculptured with faint growth lines and an impressed line revolving below the suture. Some very faint spirals show elsewhere in certain lights. The periphery is rounded. The base of the shell is convex and subperforate. The aperture is small and narrowly ovate. The columella bears a single strong fold. 〔 ( H. Pilsbry (1901), New Mollusca from Japan, The Loo Choo Islands, Formosa and The Philippines; Proceedings of the Academy of Natural Sciences of Philadelphia ) 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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